Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1985-06-13
1987-11-24
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455612, 435291, 128667, H04B 900, C12M 134, A61B 502
Patent
active
047094133
ABSTRACT:
A bidirectional fiber optic system is described in which at one terminal the output radiation of a light source (LED or semiconductor laser) is coupled through a small diameter hole in the active area of a photodiode into the core of a larger diameter transmission fiber. On the other hand, radiation propagating through the fiber in the opposite direction exits from the fiber with a large numerical aperture so that most of it is incident on the active area of the photodiode and little is lost through the hole. Also described are a number of photodiode configurations for use in such a system, as well as dual photodiodes to perform both signal detection and output monitoring functions. Further described are fiber optic sensing systems for monitoring such variables as blood pressure.
REFERENCES:
patent: 3267932 (1966-08-01), Valliere
patent: 4210029 (1980-07-01), Porter
patent: 4278349 (1981-07-01), Sander
patent: 4357106 (1982-11-01), Tschirren
"A Long Wavelength Annular In.sub.0.53 Ga.sub.0.47 As p-i-n Photodetector", S. R. Forrest, IEEE Electron Device Letters, vol. EDL-3, No. 12, Dec. 1982, pp. 415-417.
"Process, Product, and Waste Stream Monitoring with Fiber Optics," F. P. Milanovich, ISA International Conference Preprint, pp. 407-418 (1983).
Forrest Stephen R.
LieBerman Robert A.
Panock Richard L.
American Telephone and Telegraph Company AT&T Bell Laboratories
Birnbaum Lester H.
Griffin Robert L.
Telesz Jr. Andrew J.
LandOfFree
Bidirectional fiber optic systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bidirectional fiber optic systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bidirectional fiber optic systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2425653